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Debt - Summary of Amendment to Senior Secured Revolving Credit Facility (Descriptors) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Senior Secured Notes [Line Items] |
Amounts which can be increased to the credit facility, subject to lender approval (up to) | $ 150,000,000
Minimum |
Senior Secured Notes [Line Items] |
Line of credit facility commitment fee, basis points (in percentage) | 0.20%
Minimum | LIBOR |
Senior Secured Notes [Line Items] |
Line of credit, interest spread basis points (in percentage) | 1.55%
Maximum |
Senior Secured Notes [Line Items] |
Line of credit facility commitment fee, basis points (in percentage) | 0.30%
Maximum | LIBOR |
Senior Secured Notes [Line Items] |
Line of credit, interest spread basis points (in percentage) | 2.30%

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- Definition Amounts which can be increased to the credit facility, subject to lender approval. + References No definition available. + Details
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- Definition Line Of Credit Facility Basis Spread On Variable Rate + References No definition available. + Details
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- Definition Line of Credit Facility, Commitment Fee Basis Points + References No definition available. + Details
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- Definition Senior Secured Notes [Line Items] + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |